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r <br /> w ti <br /> Date November 19, 1999 <br /> ARCO QUARTERLY GROUNDWATER MONITORING REPORT <br /> Facility No 00548 Address 1612 Hammer Lane, Stockton, California <br /> ARCO Environmental Engineer Chuck Carmel <br /> Consulting Co/Contact Person Pinnacle/Mark Capps <br /> Consultant Project No 791687 01000000 <br /> Primary Agency/Regulatory ID No Lon Duncan, San Joaquin County Public Health Services <br /> WORK PERFORMED THIS QUARTER (Third 1999) <br /> 1 Groundwater samples were collected from monitoring wells MW-1 through MW-6 for laboratory <br /> analysis <br /> 2 Pinnacle compiled and evaluated groundwater monitoring data <br /> WORK PROPOSED FOR NEXT QUARTER (Fourth 1999) <br /> . 1 Pinnacle will continue to perform quarterly groundwater monitoring for ARCO The next sampling <br /> event is tentatively scheduled for December 1999 Monitoring wells MW-1 through MW-6 will be <br /> sampled and analyzed for total petroleum hydrocarbons as gasoline using USEPA Method 8015 <br /> modified, and for benzene, toluene, ethylbenzene, and total xylenes, and methyl tert-butyl ether <br /> (MTBE) using USEPA Method 8020 <br /> 2 Upon PG&E electrical installation, system start-up will occur <br /> Current Phase of Project Monitoring/Remediation <br /> Frequency of Groundwater Sampling Wells MW-1 through MW-6- Quarterly <br /> Frequency of Groundwater Monitoring Quarterly <br /> Sampling Date September 10, 1999 <br /> Is Free Product (FP) Present on Site No <br /> FP recovered this Quarter NA <br /> Cumulative FP Recovered to Date NA <br /> Approximate Depth to Groundwater 27 62 to 29 54 <br /> Direction of Groundwater Flow East <br /> Groundwater Gradient 0 004 ft/ft <br /> CP1C1Archrve\Arco105481QtrlyN0548Q399 DOC-9811sg 1 T'(�t6tGtC�C <br />